The German Expedition to South Georgia has brought back the interesting information that this island, situated in the Antarctic Ocean, Lat. 54° S., Long. 37° W., is composed of clay-slate. Not only the part the members of the expedition were able to inspect was found to be composed of this slate-rock, but the glaciers brought down the same rock from the central portion of the island. In some places the slate was interspersed with varieties of quartz. No metals were found, but the rock contained a little iron, a quantity insufficient to affect the magnetic needle.